<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>WebSocket客户端</title>
</head>
<body>
<script type="text/javascript">
    var socket;
    if (window.WebSocket) {
        socket=new WebSocket("ws://localhost:8899/ws")

        socket.onmessage=function (ev) {
            var ta=document.getElementById("responseText");
            ta.value=ta.value+"\n"+ev.data;
        }

        socket.onopen=function (ev) {
            var ta=document.getElementById("responseText");
            ta.value="连接开启";
        }
        socket.onclose=function (ev) {
            var ta=document.getElementById("responseText");
            ta.value=ta.value+"\n"+"连接关闭";
        }
    }else {
        alert('浏览器不支持websocket')
    }

    function send(message){
        if (!window.WebSocket) {
            return;
        }
        if (socket.readyState==WebSocket.OPEN){
            socket.send(message);
        } else {
            alert("连接尚未开启!");
        }

    }
</script>
<form onsubmit="return false;">
    <textarea name="message" style="width: 400px;height: 200px"></textarea>
    <input type="button" value="发送数据" onclick="send(this.form.message.value)">
    <h3>服务器输出:</h3>
    <textarea id="responseText" style="width: 400px;height: 300px;"></textarea>
    <input type="button" onclick="javascript: document.getElementById('responseText').value=''" value="清空内容">

</form>
</body>
</html>